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<?php $str = "? this is a ? test ?"; echo trim($str, '?');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/o9KOB
function name:  (null)
number of ops:  4
compiled vars:  !0 = $str
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%3F+this+is+a+%3F+test+%3F'
    4     1        FRAMELESS_ICALL_2                trim                ~2      !0, '%3F'
          2        ECHO                                                         ~2
          3      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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